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	<div id="winchm_template_button"><A href="example_5___clearing_a_flag.htm" title="Previous topic"><img id="winchm_template_prev" alt="Previous topic" src="../template2/btn_prev_n.gif" border="0"></a><A href="example_7___clearing_all_flags_for_an_image_file.htm" title="Next topic"><img id="winchm_template_next" alt="Next topic" src="../template2/btn_next_n.gif" border="0"></a></div>
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<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugging_resources.htm">Debugging Resources</A> &gt; <A href="extra_tools.htm">Tools Included in Debugging Tools for Windows</A> &gt; <A href="gflags.htm">GFlags</A> &gt; <A href="gflags_examples.htm">GFlags Examples</A> &gt; </div>
	<div id="winchm_template_title">Example 6:  Clearing All Flags</div>
</div>
<div id="winchm_template_container">
	<div id="winchm_template_content"><div id="mainSection"><p>This example demonstrates two different ways to clear all flags set in the registry and for the session:</p>
<ul>
<li>
<p>Subtract the current flag value.</p>
</li>
<li>
<p>Subtract high values.</p>
</li>
</ul>
<div class="alert"><b>Note</b>    The methods demonstrated by this example clear flags only. They do not reset the maximum stack trace size or kernel special pool tag to the default values. </div>
<div> </div>
<h3><a id="Subtract_the_Current_Flag_Value"></a><a id="subtract_the_current_flag_value"></a><a id="SUBTRACT_THE_CURRENT_FLAG_VALUE"></a>Subtract the Current Flag Value</h3>
<p>The following command clears all flags set in the system-wide flag entry in the registry by subtracting the current value of the entry. In this example, the current value is 0xE0. The command uses the <b>/r</b> parameter to indicate the system-wide registry mode and the E0 value with a minus sign (-) to subtract E0 from the flag value.</p>
<div class="code"><span codelanguage=""><table>
<tr>
<th></th>
</tr>
<tr>
<td>
<pre>gflags /r -E0 </pre>
</td>
</tr>
</table></span></div>
<p>In response, GFlags displays the revised value of system-wide flag registry entry. A value of zero indicates that the command is successful and that there are no longer any system-wide flags set in the registry.</p>
<div class="code"><span codelanguage=""><table>
<tr>
<th></th>
</tr>
<tr>
<td>
<pre>Current Boot Registry Settings are: 00000000 </pre>
</td>
</tr>
</table></span></div>
<p>Note that the following commands have the same effect as the command used in this example and can be used interchangeably:</p>
<div class="code"><span codelanguage=""><table>
<tr>
<th></th>
</tr>
<tr>
<td>
<pre>gflags /r -20 -40 -80 
gflags /r -hfc -hpc -hvc </pre>
</td>
</tr>
</table></span></div>
<h3><a id="Subtract_High_Values"></a><a id="subtract_high_values"></a><a id="SUBTRACT_HIGH_VALUES"></a>Subtract High Values</h3>
<p>The following command clears all system-wide flags by subtracting high values (0xFFFFFFFF) from the system-wide flag setting.</p>
<div class="code"><span codelanguage=""><table>
<tr>
<th></th>
</tr>
<tr>
<td>
<pre>gflags /r -ffffffff </pre>
</td>
</tr>
</table></span></div>
<p>In response, GFlags displays the revised value of the system-wide flag entry. A value of zero indicates that the command is successful and that there are no longer any system-wide flags set in the registry.</p>
<div class="code"><span codelanguage=""><table>
<tr>
<th></th>
</tr>
<tr>
<td>
<pre>Current Boot Registry Settings are: 00000000 </pre>
</td>
</tr>
</table></span></div>
<div class="alert"><b>Tip</b>  
       Type this command into Notepad, then save the file as clearflag.bat. Thereafter, to clear all flags, just type <b>ClearFlag</b>. </div>
<div> </div>
<p>Finally, the following example demonstrates that the intuitive method of clearing all flags does not work.</p>
<p>The following command appears to set the value of the system-wide flag entry to 0. However, it actually adds zero to the system-wide flag value. In this example, the current value of the system-wide flag entry is 0xE0.</p>
<div class="code"><span codelanguage=""><table>
<tr>
<th></th>
</tr>
<tr>
<td>
<pre>gflags /r 0 </pre>
</td>
</tr>
</table></span></div>
<p>In response, GFlags displays the system-wide flag value after the command completes:</p>
<div class="code"><span codelanguage=""><table>
<tr>
<th></th>
</tr>
<tr>
<td>
<pre>Current Boot Registry Settings are: 000000e0
    hfc - Enable heap free checking
    hpc - Enable heap parameter checking
    hvc - Enable heap validation on call</pre>
</td>
</tr>
</table></span></div>
<p>The command has no effect because it adds the value 0 to system-wide flag entry.</p></div></div>	
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